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Science encourages you to discuss and debate articles in the comments section. Online comments are published online only, but may be excerpted in print. They are short, timely, topical comments on Research, Commentary, and News articles published in Science in the past 3 months. Comments should be less than 300 words. Statements should be supported by full references when appropriate, with a maximum of 10 references. Comments should not include announcements for commercial products; self-promotion of published or unpublished work; or material that has previously been published online or in print. Science will not publish material that is offensive, derogatory, obscene, infringing of any third party's rights, or contrary to local, national, and international laws and regulations.

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